// 公告滚动条-样式
@mixin c-scroll($h: 20em, $ch: 10px, $cw: 10px){
  max-height: $h;
  overflow: auto;
  &::-webkit-scrollbar {/*滚动条整体样式*/
    width: $ch;     /*高宽分别对应横竖滚动条的尺寸*/
    height: $cw;
    background-color: #F5F5F5;
  }
  &::-webkit-scrollbar-thumb{/*滚动条里面小方块*/
    border-radius: 5px;
    -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
    background: rgba(0,0,0,0.2);
  }
  &::-webkit-scrollbar-track {/*滚动条里面轨道*/
    -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
    border-radius: 5px;
    background: rgba(0,0,0,0.1);
  }
}